On the site www.vReference.com I came across a post announcing the “vSphere 4 reference card”. Wondering what this was I started reading the post.
It seems that Forbes Guthrie made a document containing hard limits for the vSphere 4 products. I found the list of items very wide and should come in handy when looking for limits of the vSphere 4 products.
The reference card is refreshed every now and then, so check out the site periodically. Or subscribe to the RSS feed of the site.
Hopefully this card can help you as future reference. I found it to be very helpful.